I have looked on the net but all the examples that I understand I can see other statements that can be used more effectively, or the code they give as an example doesn't work. It may be that the code I'm looking at is too simple as some excerpts where it is used is way above my current understanding.
I'm probably just having a blonde day but if someone has a way of explaining to me in a practical sense I would much appreciate it as it's really bugging me
Thanks
Ian